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Method for preparing designable layered polymer base conductive composite material

A conductive composite material and polymer technology, which is applied in the field of polymer processing, can solve the problems that the electrical conductivity is difficult to be designed, and the conductive composite material is difficult to obtain a repeatable and controllable ideal shape structure, etc., to achieve simple and easy equipment high yield, low production cost, and improved elongation at break

Inactive Publication Date: 2008-07-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a new method for preparing polymer-based conductive composite materials in view of the current situation of preparing polymer-based conductive composite materials, so as to solve the problem that the conductive composite materials prepared by the preparation method of conductive composite materials in the prior art are difficult to obtain Repeatable and controllable ideal morphological structure, conductive performance is difficult to have technical problems such as designability

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  • Method for preparing designable layered polymer base conductive composite material

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Embodiment 1

[0027] The raw materials are polypropylene and carbon black, the insulating layer and the conductive layer are pure polypropylene and carbon black filled polypropylene respectively. Firstly, common carbon black-filled polypropylene was prepared, with a carbon black content of 11%. After the polypropylene and carbon black were dried, they were melt-mixed and granulated in a twin-screw extruder. The conductive layer and insulating layer pellets are put into the two extruders of the layered co-extrusion device respectively. The extruder speed ratio is 1:1. The temperature of each section of the extruder is controlled between 170-200 °C. The temperature of the stacking unit and the exit mold are both 200°C. Using two stacking units, the melt of the conductive composite product flows out of the exit mold under the traction of the traction device, and after being cooled by the cooling device, an 8-layer layer is prepared Polypropylene-based conductive composites. The resistivity of...

Embodiment 2

[0029]The raw materials are polyethylene and carbon black, and the insulating layer and conductive layer are respectively pure polyethylene and carbon black filled polyethylene. First, ordinary carbon black-filled polyethylene was prepared, with a carbon black content of 11%. After the polyethylene and carbon black were dried, they were melt-mixed and granulated in a twin-screw extruder. The conductive layer and insulating layer pellets are put into the two extruders of the micro-layer co-extrusion device respectively. The extruder speed ratio is 2:1. The temperatures of the lamination unit and the outlet die were both 200°C, and a 4-layer layered polyethylene-based conductive composite was prepared using one lamination unit. The resistivity of the material is 5.02×10 3 Ω·cm, PTC strength is 3.26, elongation at break is 316%. As a comparison, the resistivity and elongation at break of the traditional polyethylene-based conductive composite with the same carbon black content ...

Embodiment 3

[0031] The raw materials are polypropylene and carbon black, the insulating layer and the conductive layer are pure polypropylene and carbon black filled polypropylene respectively. First prepare ordinary carbon black-filled polypropylene with carbon black content of 2, 4, 6, 8, 10, 12, 14, 18, 22, 30% respectively: after drying polypropylene and carbon black, extrude Melt mixing and granulation in the machine. The conductive layer and insulating layer pellets are put into the two extruders of the micro-layer co-extrusion device respectively. The extruder speed ratio is 1:1. The temperatures of the lamination unit and the outlet die were both 200°C, and a 4-layer layered polypropylene-based conductive composite was prepared using one lamination unit. The percolation value for this material is approximately 5.0 wt%. For comparison, the percolation value of conventional polypropylene-based conductive composites is about 7.0 wt%.

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Abstract

The invention provides a microlayer coextrusion device to prepare layered polymer-based conducting composite material with insulating layers and conducting layers, which are interlaced. The insulating layer granules and the conducting layer granules are fed into two extruders of the microlayer coextrusion device for fusion and plastification. Two streams of fusant are superposed into two layers at the position of a convergence unit. After the fusant is cut and superposed by n separation and superposition units, the composite material of 2<N+1> layers is got. The conductibility of the material has anisotropy. The proportion of the number of the layers to the thickness of the conducting layers and the insulating layers is determined by the number of the separation and superposition units and the speed ratio of the extruders. Accordingly, the percolation value and the resistivity of the conducting material are designable. Compared with the traditional method of preparation, the polymer conduction composite material prepared by the invention has the characteristics of low percolation value, low resistivity, and high breaking extensibility. The equipment provided by the invention is simple and available. The required raw materials are sold in the market without synthetizing other chemicals. The equipment is operated simply; the manufacturing cost is low; the efficiency is high.

Description

1. Technical field [0001] The invention relates to the field of polymer processing, and more particularly, the invention relates to the preparation of polymer-based conductive composite materials. 2. Background technology [0002] Polymer-based conductive composite material is a functional composite material formed by filling conductive substances into the polymer matrix in a certain way and processing technology. It can not only meet people's needs for conductive materials, but also because of its light weight, easy It is processed into various complex shapes, has good chemical stability, and the conductivity can be adjusted in a wide range, so it has been widely used, and has aroused great interest in the study of its conductive structure and properties in academia and industry, and promoted the development of The development of modern materials science. Polymer-based conductive composite materials can be widely used as antistatic materials, conductive materials, resistor...

Claims

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Application Information

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IPC IPC(8): B29C47/06B29C47/12B29C47/56B29K105/06B29K507/04B29K505/00B29K23/00B29K27/06B29K25/00B29K77/00B29K33/04B29K67/00B29K75/00B29C48/30
Inventor 李姜许双喜郭少云文明王明沈佳斌
Owner SICHUAN UNIV
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